The above should have helped to clarify these three verbs; you ought now to know how to use them; I must stop writing immediately!请问：should have helped是否要改为should help？
前面一位网友提出了一个关于从句理解的句子：He always leaves his clothes lying on the floor where he took them off.(http://ask.yygrammar.com/q-22435.html )请问：这个句子的主句和从句的时态这样不一致也可以吗？不算错吗？
The man couldn't stop himself laughing and glancing around at her naughtiness.老师您好: 我想问这里的glance around后面为什么还有加一个介词at，直接用around不可以吗？laugh和glance之间用and连接会不会体现不出来动作的主次关系呢？麻烦老师帮我...
Yet the Nile has been changed by modern man in ways not yet fully understood.答案是：然而尼罗河已经为现代人所改变了，不过就连他们自己也不完全了解尼罗河改变的方式。我翻译的是：然而现代人用了一种至今难以理解的方式把尼罗河改变了 ...
...题请教：（1）Are
you wondering how your business stacks up against the competition? Do
you know that Tim Tebow has never hosted a late-night talk show in Denmark? 对于以上这种宾语从句型的句尾语调吗，在美式发音中，应该是升调还是降调呢？（我学的是美式...
He will come to call on you the moment he（ ）his painting.A. will finish B. finishedC. has finished D. had finished答案是C。如果是主将从现不应该是he finishes his painting吗?还有，如何判断是一般将来时还是完成时，是看有没有时间戳吗？
What measures will MOFCOM, the competent department for free trade zones, adopt to promote such liberalization going forward?问：网上说只有promote sb to do 句型，而promote sb/sth doing句型是错的，那我看到了上面这个句子，其中promote such liberalization going forward，...
尊敬的老师好！有这样一道单项选择题：Some teachers _____ the only students _____ study hard.A. like, whoB. likes, thatC. like, thatD. like, whom参考答案是 C. like, that，为什么不能选择 A. like, who 呢？